Differential gear shaft residual heat tempering Anhui Suzhou State Machinery Factory 234000) Zhao Changsheng Tractor differential gear shaft is an important part of the differential, it bears a large impact load and withstands the wear of the gear bore Therefore, it is required to have a relatively strong strength and hardness. Carburizing, bonfire and tempering are generally used to achieve the required technical performance.
Left and right), for this reason, we canceled the tempering process after the quenching of the differential shaft, and achieved good results in the residual heat tempering test.
After carbon, pre-cooled to 840t: quenched into the oil pool, due to more workpieces (above 300kg), the oil temperature quickly rises to 150t: about 2 hours, after 2h, remove the differential gear shaft from the oil pool (this time oil The temperature is still compared with the 180TC, 2h tempered differential gear shaft after carburizing and quenching: the hardness is slightly less than 0.51HRC. The wear test shows that the gear shaft after residual heat tempering is slightly better than conventional tempering. Years of production practice have shown that no break has been found in the 2000 differential gear shafts produced using residual heat tempering.
The residual heat of the oil (lOOt: above) is used to carry out the residual heat tempering, which also increases the service life.
Practice has proved that the tempering of the residual heat of the oil after quenching of the alloy steel workpiece can save energy, reduce production cost, improve production efficiency, and have significant economic benefits. It is an energy-saving process worthy of promotion and application for small and medium-sized machinery factories with few equipments. (20000918)
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